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27 lines
989 B
Scala
27 lines
989 B
Scala
package com.twitter.follow_recommendations.common.candidate_sources.base
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import com.twitter.escherbird.util.stitchcache.StitchCache
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import com.twitter.finagle.stats.StatsReceiver
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import com.twitter.product_mixer.core.functional_component.candidate_source.CandidateSource
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import com.twitter.product_mixer.core.model.common.identifier.CandidateSourceIdentifier
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import com.twitter.stitch.Stitch
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import com.twitter.util.Duration
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class CachedCandidateSource[K <: Object, V <: Object](
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candidateSource: CandidateSource[K, V],
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maxCacheSize: Int,
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cacheTTL: Duration,
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statsReceiver: StatsReceiver,
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override val identifier: CandidateSourceIdentifier)
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extends CandidateSource[K, V] {
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private val cache = StitchCache[K, Seq[V]](
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maxCacheSize = maxCacheSize,
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ttl = cacheTTL,
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statsReceiver = statsReceiver.scope(identifier.name, "cache"),
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underlyingCall = (k: K) => candidateSource(k)
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)
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override def apply(target: K): Stitch[Seq[V]] = cache.readThrough(target)
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}
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